The co-existence of electrons and positrons in an electron-positron-ion
(EPI) plasma medium (EPIPM) which creates a new field of research for the
physicists to understand the nonlinear collective features of EPIPM by
considering waves dynamics, namely, ion-acoustic (IA)
waves (IAWs) [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}, positron-acoustic waves (PAWs),
electron-acoustic waves (EAWs) [8]}, and IA rogue waves (IARWs)
as well as their associated nonlinear structures such as solitons [4]}, [5]}, dark and bright envelope solitons [2]}, shocks,
rogue waves [6]}, double layers has been identified by the
THEMIS mission [13]} and Viking Satellite [14]} in both
space (viz., Saturn's magnetosphere [1]}, early universe [4]},
solar atmosphere [1]}, active galactic nuclei [18]},
pulsar magnetosphere [4]}, and polar regions of neutron
stars [20]}, etc.) and laboratory environments (viz., high intensity
laser irradiation [4]}, semiconductor plasmas [18]},
hot cathode discharge [4]}, and magnetic confinement systems
[18]}, etc.).
